Impending Doom?

There is A Band Called Impending Doom and Ive read all over the place "they rock...They are Brutial...And There Christian" So i was happy ...I was like awsome ...I went to their Myspace and i saw at the Bottom of the Band Discripiton thingy it said they refuse to Mess with the Demonic side of Death Metal...and i was like cool...again...So i read their lyrics to "for All Who Have sinned" Very Christan...I was like cool...I likem....So i went in Frostwire and Typed there Name In and Got like 100 songs i started Downloading...Then i came Upon A song Called "burn the House Of God" i was like well...So i looked up the lyrics and just thought it was goin to be like System Of A Downs Song Ddevil which isnt about the devil at all...Well this song was actually about Burin the house of God...and it talks about Riseing up AGINAST god....WTF...Heres my Question ....Are they Christan cause if so why whould u make a song like that or was it just the way I Read It??